Drilling mechanism



June 12, 1934. F w VODOZ DRILLING MEGHANISM 1928 3 Sheets-Sheet l n Original Filed March 21 WQAM@ June 12, 1934. F w VODOZ 1,963,039

DRILLING MECHANISM Original Filed March 21, 19.28 3 Sheets-Sheet 2 une 12, 1934. F` W VODOZ 1,963,039

DRILLING MECHANISM Original Filed March 2l, 1928 3 Sheets-Sheet I5 y @f Ew Patented June 12, 1934 UNITED STATES PATENT OFFICE DRILLIN G MECHANISM Application March 21, 1928, Serial No. 263,402 Renewed June 11, 1931 16 Claims.

This invention relates to improvements in drilling mechanisms particularly adapted for use in coal mines, and has for its principal object to provide a new and improved drilling mechanism r j in combination with a mining machine or similar power mechanism which may be mounted on and operated from said mining machine.

Other objects of my invention will appear from time to time as this specification proceeds.

lj The general practice in coal mining operations is to drill the coal with a hand operated post drill or small portable electric drill after the mining machine has completed its undercutting operation. Drilling by hand usually requires v'l5 more than one man and has proven to be very Slowand expensive. While drilling with a portable electric drill is faster than hand drilling, more than one man is usually required to handle the drilling mechanism, and in order to make 204y said mechanism portable and easy to handle, said mechanism is often made too light to give satisfactory service.

In carrying out my invention I provide an improved form of drilling mechanism so combined and carried with a coal cutting machine as to afford sufficient strength to withstand all strains subjected to it due to drilling, and which moreover provides a drilling mechanism operable by one man whereby the coal may be drilled v during the undercutting of the coal and by the same crew that operates the coal cutting machine.

My invention may be more clearly understood by reference to the accompanying drawings wherein:

Figure 1 is a plan view of a mining machine of the continuous cutter type having my invention applied thereto;

Figure 2 is a side elevation of the machine shown in Figure 1 with the drilling mechanism in another position than shown in Figure 1;

Figure 3 is an enlarged fragmentary plan View 0f the rear portion of the mining machine shown in Figure 1, with parts shown in section;

Figure 4 is an enlarged fragmentary side View of a mining machine, with parts shown in section;

Figure 5 is an enlarged fragmentary sectional View taken on line 55 of Figure l;

Figure 6 is a detail side view of the drill head showing the drill tube in section;

Figure 7 is a front end view of the drill head shown in Figure 6 with the drill shown in section;

Figure 8 is a detail sideview of the drill head V used in the device embodying my invention with (Cl. Z55-46) the drill tube in section, and in a different position from Figure 6;

Figure 9 is a cross-sectional view taken on line 9 9 of Figure 6;

Figure 10 is a side elevation of the device 60 shown in operative position relative to a mine Wall; and

Figure 11 is an'enlarged detail sectional view showing overload release means for the drilling mechanism.

In the drawings, one embodiment of my invention is illustrated as applied to a mining machine of the ordinary continuous cutter, or shortwall vtype having a frame 2 with a chain carrying cutter bar 3 projecting forwardly there- 70 from. Two power driven feed drums 4, 4, are provided with cables arranged inthe usual and well known manner to maneuver saidmachine on the mine floor, and feed it across a mine face. The feeding and cutting means for said mining machine are operatively driven from an electric motor 5 through a suitable gear train of the well known type generally used in mining machines of this design which is not herein shown since it is no part of my invention. 8o

A drilling mechanism is supported bodily on said mining machine, herein being mounted on the rearward end thereof by supports '7 and 8, and comprises 'in general a member 10 mounted for rotatable movement in supports '7 and 8, and a supporting casing 11 at the outer end thereof having a tubular arm 12 projecting longitudinally forwardly therefrom which in turn has a drilling head 14 adjustably mounted on its forward end.

It mayhere be seen that the entire drilling mechanism is supported by the member 10 at the rearward end of the mining machine frame 2 and that the drilling head 14 is vertically adjustable by moving the arm 12 about the axis of the member 10 and that said drilling head will be held in 95 a stationary position when the member 10 is held in a stationary position. Clamping means are provided to hold the member 10 from rotation which herein comprises bolts 15, 15, passing through the portion of each support 7 and 8 which encircles the member 10, and each having a handle 16 threaded thereon. The portions of the members 7 and 8 surrounding the member 10 are split in the horizontal plane at the rearward end thereof so tightening of the handles 16 on the .105 bolts 15 contracts the portion of the supports surrounding the members 10 and this clamps the member 10 in a stationary position. Brackets 18 and 19 are provided to support the drilling mechanism in its lowered or inoperative position.

locking means at the opposite side The tubular arm 12 is preferably shrunk on a member 17 which in turn is bolted to the supporting casing 11. A gasket 17a of any suitable resilient material is interposed between the inember 17 and the supporting casing 11. Similarly, the supporting casing 11 is bolted to the meinber 10 and a resilient gasket 10a is interposed between said supporting casing and the member l0. These gaskets are so interposed between the member 10, supporting casing 11 and member 1,7, as to take up shocks and vibration imparted to said members through the drilling head 14.-

-teferring now in particular to the drilling head 14 as shown in Figures 1, 2, 6, 7 and 8, said head is supported on a member which is inserted in the tubular arm 12 at the forward end thereof so that said member is rotatable in said tubular arm. Means are provided to hold the member 20 in any desired position, which herein comprises a longitudinally split sleeve 21 surrounding the tubular arm 12 and member 20, having a suitable means for tightening said sleeve on said tubular arm; as, for example, a screw 22 is threaded into a lug 23 on one side of a slit 24 in said sleeve having a handle on its opposite end and bearing against a portion of the same lug 23 on the opposite side of the slit 24 so that turning of the handle 25 in one direction contracts the sleeve 21 about thetubular arm 12 and tightens said arm about the member 20 to hold said member in a stationary position.

A supporting member 26 is trunnioned on the upper portion of the member 29. A bearing 27 is provided at the forward portion of the supporting member 26 for receiving the outer periphery of the hub of a gear 28. A cap piece 29 is bolted to the forward portion thereof lto hold the gear 28 in position on the member 26. A feeding and supporting collar 30 is integral witha rear portion of the supporting member 26. Said collar is split in a horizontal plane and has a top portion 31 threaded on its inner periphery to engage va threaded tube 32. Said top portion is hinged on a'pin 30a at one side thereof and has a suitable thereof so said threaded portion may readily be disengaged from the threaded tube 32 and said tube may be quickly removed from said collar at will.

A shoe 31a is provided on the lowerl portion of the collar 30 and provides a supporting surface for the member 32. The locking means herein shown comprises a link 33 pivoted to the lower portion of the collar 30 at one end and having an eccentric cam 34 pivoted to its opposite end.

The cam 34 bears against a projection 35 on the top portion of the collar 30 and has a handle 36 thereon to force the cam 34 against the projection 35 and lock the collar 30 in a closed position and thus cause the threaded tube 32 to move 1ongitudinally of said collar on rotation of said tube. To stop longitudinal movement of said' tube it is simply necessary to release the cam 34 from the projection 35 andA open the collar 30.

The means for holding the supporting member 26 in a stationary position herein comprises a sector 38 which depends from said supporting member and has a plurality of holes 39 therein which are adapted to receive a spring actuated plunger 40 which works in the lug 23 projecting from the split sleeve 21. A pin 4-1 depending lfrom the plunger 40 is providedV to aid in Vthe removal of the plunger 40 from the holes 39.

The threaded tube v32 is adapted to receive a drill 42 therein. The drill 42 may be of any type `but is herein shown as a twist drill' having its` blade of the same type as is ordinarily used in coal mine drills. A chuck 44 is provided at the for- Ward end of the tube 32 to hold the drill 42 in said tube. The tube 32 passes through the collar 30 and hub of the gear 28 and has a keyway 45 extending longitudinally therewith. A feather key 46 is slidable in said keyway and provides a means to key the gear 28 to said tube to rotate said tube through said gear.

Y( f The chuck 44 comprises a member 47 threaded on the end of the threaded tube 32 which has a clamping means for holding the blades of the drill 42 at the forward end thereof. The holding or clamping means for the drill 42 comprise two holding pieces 48 and 49 pivoted to the member 47 at a common point.

has an eccentric cam 52 pivoted to its opposite end which is adapted to bear against the clamping member 48. A handle 53 is provided to operate said cam so that When said handle is in an upright position the cam 52 will bear against the member 48 to lock the members 48 and 49 together and clamp the drill 42 so as to extend from the end of the tube 32, in any Aposition of adjustment desired.

Referring now to the means for driving the gear 28 and rotating the drill 42 and feeding said drill into the coal from the mining machine motor 5 it may be seen that the gear 28 meshes with a gear 55 on a shaft 56 journaled in the member 20 at one end and in the member 17 at its opposite end, and that the gear 55 is adapted to drive the gear 28 when said gear is at various angles withrespect to the gear 55. Provision is made for'driving the gear 28 from the gear 55 at the several permissible angles of said gears relative to-each other, by arranging the pivotal axis of the members 20 and 26 so it Will coincide with the pitch circles of both gears 55 and 28, and providing said gears with relatively deepI teeth chamfered at their edges to prevent binding between said gears.

The shaft 56 is rotatable by a bevel pinion 57 which is driven by a bevel gear 58 having operative connection `with a transverse stub shaft 59 through a safety clutch 60. A transverse shaft 61 journaled in the member 10 is coaxial with the stub shaft 59 and abuts the inner end of said stub shaft. The stub shaft 59 is provided with an up'turned inner end of an irregular shape which fits in a socket 62 on the end of the transverse shaft 61 for driving the stub shaft 59 from said transverse shaft. Two shafts coupled together are used here instead of one continuous shaft to enable the supporting casing 11 to be quickly removed from the member 10 Without removing the entire shaft from said member with the gears thereon and to provide a flexible connection between the member 10 and supporting casing 11 to prevent bending of said shaft which would necessarily occur if said shaft were a continuous shaft, on account of the resilient connection between the member 10 and supporting casing 11. The shaft 61 is in turn driven by a gear 63 on the outer periphery of a casing 64 of a planetary gear device 65 which has driving connection with a gear 66 xed to said shaft. The planetary gear device 651s driven by the motor 5 in the usualmanneremployed in mining machines ofthistype; viz., through a motor pinion 67, driven pinion 68, shaft 69, worm and worm gear reduction drive generally indicated at 70 which has driving connection with a transverse shaft 7-1 and the planetary gear device 65.

A link 51 is pivoted at the lower end of the holding piece 49. Said link 'I'he planetary gear device 65 is of the type ordinarily used in mining machines; as, for example, that disclosed in a patent issued to Charles E. Davis, No. 1,430,799, issued October 3, 1922.

The casing 64 is rotatable through a sun gear 81, planetary pinions 82, cage 83 holding said planetary pinions, and internal gear 72 keyed to the inner periphery of the casing 64. Planetary pinions 84 are also held in the cage 83 and rotate with the planetary pinions 82 to rotate an internal gear 85 integral with a casing 86 rotating within the casing 64, to provide a drive fori` either rope drum 4 at a reduced speed from the speed of the sun gear 81. A friction band 73 surrounds the casing 86 to prevent rotation thereof when it is desired to transmit power to the rope drums 4 through said casing. When the friction band 73 is loose on the casing 64 said casing will rotate and the gear 66 on the shaft 61 will be rotated by the gear 63 to drive the drilling mechanism and drill 42. When the friction band 73 is tight on the casing 64 said casing and the gear 63 are held stationary to stop the driving of the drilling mechanism and drill 42. The friction band 73 is tightened on the casing 64 by means of a hand wheel 74 in the usual manner; namely, said hand wheel is fixed to a rod which is threaded in a lug 87 on one end of said friction band. A `collar 88 is interposed between the hand wheel '74 and a lug 89 on the opposite end of said friction band so that turning of the said hand wheel in one direction brings the ends of the friction band 73 together to tighten said friction band on the casing 64 and vice versa.

The safety clutch 60 (see Figures 3 and 5) comprises a plate 75 having a hub thereon keyed to the shaft 59 abutting avplate 76 having a hub integral therewith feathered on a hub '77 of the bevel gear 58 and having a plurality of compression springs 78 interposed between the bevel gear 58 and the plate 76 to cause the plate 76 to bear against the plate 75. Indentations 79 in the shape of spherical segments are provided in the abutting facesof the plates '75 and '76 to receive steel balls 80 to form a driving connection between the plates 75 and 76. The angle of incidence of the indentations 79 in the plate 75 is such that when sudden excess loads are imposed on the drilling mechanism and bevel gear 58 due to the striking of hard spots in the coal such as rock or sulphur balls, by the drill 42, the balls 80 will slip out of said indentations on the plate 76 to allow the plate 75 to rotate while the plate 76 remains stationary. This relieves all strain from the drill 42 and the gearing for said drill and prevents breakage of said parts.

It may now be seen that I have provided a simple and strong means for supporting a mining drill so said drill may be operated at various elevations and angles with respect to the face of the coal, and that I have provided strong and simple feeding and driving means for said drill whereby said drill may be driven from the mining machine motor 5 in all of its possible positions of adjustment by simply turning the hand wheel 74 to loosen the tension of the friction band 73 on the casing 64.

It should also be noted that the gear 28 both rotates the drill 42 and causes said drill to be fed into the mine wall and that said drill is supported inside of the threaded tube 32 which passes through the central portion of the gear 28 and moves longitudinally through the hub of said gear as said gear is driving said threaded tube in a rotational direction. This is accomplished by journalling the gear 28 in the bearing 27 on the support 26 and feathering said gear to the threaded tube 32. When the collar 30 is closed about the threaded tube 32 and the threaded portion of said collar engages the threaded tube 32, and said threaded tube isl rotated by the gear 28, said tube will be moved longitudinally through the hub of said gear, the feather key 46 sliding in the longitudinal keyway 45 in the threaded tube 32.

. Referring now in particular to Figure 10 showing a mining machine with a drill such as is described in my invention drilling a hole in the mine wall, it may be seen that said mining machine may be fed as usual to undercut the coal but its feedlng movementis stopped at any point where it is desired to place a drill hole in the mine wall. The drill is carried in lowered position during the undercutting operation, but when the machine is stopped, the arm 12 is swung upwardly to the desired height for drilling, as shown in Figure 10. A chain 90 extends from a hook 91 on the mining machine frame 2 to a bracket 92 on the forward portion of the tubular supporting arm 12. By hooking different links of the chain 90 on the hook 91 said chain provides means for limiting the upward movement of the drill arm, and also is arranged to be taut when the drill is in drilling position, so as to relieve strains from the member 10 and supporting casing 11 as the drill 42 is advanced into the coal.

The drill 42 shown in Figure 10 has advanced into the mine wall to a portion of the full depth of the hole desired, which is usually the depth of out made by the cutter bar 3 and varies from five and one-half to eight feet in depth, according to the length of cutter bar used. Since the tubular supporting arm 12 is inclined from'the rear of the mining machine toward the mine wall it may be seen that it is seldom possible to place the drilling head 14 far enough away from the face of the coal to drill the hole to its full depth in one operation but that it is necessary to advance said drill into the coal by stages. Due to the construction of my drilling head this is a distinct advantage in drilling since the drilling head 14 is always close to the face of the coal which insures a more accurate drill hole than could otherwise be obtained and minimizes `the danger of binding the drill due to a crooked drill hole, since the drill may be simply and quickly advanced in its chuck to prepare for each succeeding stage. As the construction of the drilling head 14 has been hereinbefore explained it may be seen that when the chuck 44 nears'the face of the coal the drill is stopped by tightening the friction band 73 on the casing 64 by means of the hand `wheel 74, the chuck 44 is released from the drill, the threaded portion 31 of the collar 30 is released from the threaded tube 32, the threaded tube 32 is moved rearwardly until the chuck 44 nears the support 26, the chuck 44 is tightened about the drill 42, the collar 30 is tightened about the threaded tube 32 and the friction band 73 is released from the casing 64 so the drill may again be fed intothe coal to complete the drilling of the hole.

Although I have herein shown and described one form in which my invention may be embodied in combination with a mining machine, of the continuous cutter type, it will be understood that the construction and arrangement of the parts may be altered and that my invention need not be used in combination with a mining machine o f the type shown, but may be used in combination with any other type of mining machine or portable power device.

I claim as my invention:

v1. In a drilling apparatus, a motor, a swinging arm, a drilling head on the free end of said arm supported for adjustment about axes coincident with and perpendicular to the longituals dinal axis of said swinging arm, a threaded member supported by and movable with respect to said drilling head, drill holding means on said threaded member, a drill supported by said threaded member, means for imparting translational and rotational movement to said drill comprising a gear feathered to said threaded member, and means for driving said gear from said motor comprising a spur gear supported by said swinging arm having driving engagement with said first mentioned gear in all positions of said drilling head with respect to said swinging arm.

' 2. .In a drilling apparatus, a motor, a swinging arm, a drilling head on the free end of said arm supported for adjustment about axes coincident with and perpendicular to the longitudinal axis of said swinging arm, a threaded member supported by and movable with respect to said drilling head, drill holding means on said threaded member, a drill supported by said threaded member, means for imparting translational and rotational movement tosaid drill comprising a gear feathered to said threaded member, and means for driving said gear from said motor comprising a spur gear supported by said swinging arm having driving engagement T with said first mentioned gear in all positions of said drilling head with respect to said swinging arm, and a shaft within said swinging arm for driving said last mentioned spur gear.

3. In a drilling apparatus, a motor, a swingj ing arm, aV drilling head on the free end of said arm supported for adjustment about axes coincident with and perpendicular to the longitudinal axis of said swinging arm, a threaded member supported by and movable with respect to said drilling head, drill holding means on said threaded member, al drill carried within said threaded member, means for imparting translational and rotational movement to said vdrill comprising a gear feathered to said threaded member, and means for driving -said gear from said motor comprising a spur gear supported by said swinging arm having driving engagement with said first mentioned gear in all positions of said drilling head with respect to said swinging arm.

Y 4. In a drilling apparatus, a motor, a swinging arm, Va drilling head on the free end o-f said arm supported for adjustment about axes coincident with and perpendicular to the longitudinal axis of said swinging arm, a threaded member supported by and movable with respect to said drilling head. drill holding means on said threaded member, a drill carried within said threaded member, means for imparting translational and rotational movement to said drill comprising a gear feathered to said threaded member, and means for driving said gear from said motor comprising a spur gear supported by said swinging varm having driving engagement with said first mentioned gear in all positions of said drilling head with respect to said swinging arm, anda shaft carried within said swinging arm for driving said last Vmentioned spur gear.

5. In combination with a mining machine, a supporting member extending transversely of said mining machine rearwardly of said motor, a longitudinally extending supporting arm supported by said supporting member'for movement about an axis extending transversely of said mining machine, a drilling head on the forward end of said arm, said drilling head being mounted for adjustment about axes coincident with and perpendicular to the longitudinal axis of said arm, drill feeding and rotating means on said drilling head comprising a threaded member having Va drill supported thereby, a gear feathered to said threaded member, feeding means engageable with the threads on said threaded member, and means for driving said gear in all positions of adjustment of said drilling head with respect to said supporting arm comprising a spur gear supported by said supporting arm and a shaft carried within said supporting arm for driving said gear.

6. In an apparatus of the class described, a portable support, a motor on said portable support, an arm supported at one end on said portable support for rocking movement with respect thereto, a drilling head mounted on the free end of said arm for adjustment about an axis coincident with the longitudinal axis of said arm and about an axis perpendicular to the longitudinal axis of said arm, a drill holding and advancing member carried by said drilling head, a drill carried by said drill holding and advancing member, and means for driving said drill from said motor in the several permissible positions of adjustment of said drill with respect to said arm including a spur gear feathered to said drill holding and advancing member, a drive shaft carried within said arm and a spur gear on said shaft for driving said last mentioned spur gear.

7. In a drilling apparatus, a support including a mining machine, said mining machine including a motor, a forwardly extending cutter bar, flexible feeding mechanism rearwardly of said cutter bar, means for driving said flexible feeding Vmechanism from said motor, a swinging arm supported on said mining machine, drilling mechanism including a drilling head supported on the free end of said swinging arm for adjustment about axes coincident with and perpendicular to the longitudinal axis of said swinging arm, said drilling head including a drill holding and advancing member, a drill supported by said drill holding and advancing member, and drive mechanism connectible with said means for driving said flexible feeding mechanism from said motor forv imparting independent or simultaneous translational and rotational movement to said drill holding and advancing member including 'a drive shaft supported with-in said swinging arm, a spur gear journaled in said drilling head and having driving connection with said drill holding and advancing member and a spur gear on the outer end of said drive shaft and meshing with said first mentioned spur gear for driving said spur gear in all positions of adjustment of said drilling head with respect to said swinging arm.

8. In a drilling apparatusa support including a mining machine, said mining machine including a motor, a forwardly extending cutter bar, flexible feeding mechanism rearwardly of said cutter bar, means for driving said flexible feeding mechanism from said motor including a planetary gear reduction vdevice having an outer casing, a swinging arm supported on said mining machine, drilling -mechanism including a drilling head supported on the free end of said .swinging arm for adjustment about axes `coincident with and perpendicular to the longitudinal vaxis of said swinging arm, said drilling head including a drill holding and advancing member, a drill supported by said drill holding an advancing member, and drive mechanism connectible with said casing of said planetary gear reduction device for imparting independent or simultaneous translational and rotational movement to said drill holding and advancing member.

9. In a drilling apparatus, a support including a mining machine, said mining machine including a motor, a forwardly extending cutter bar, exible feeding mechanism rearwardly of said cutter bar, means for driving said ilexible feeding mechanism from said motor inclu-ding a planetary gear reduction device having an outer casing a swinging arm supported on said mining machine, drilling mechanism including a drilling head supported on the free end of said swinging arm for adjustment about axes coincident with and perpendicular to the longitudinal axis of said swinging arm, said drilling head including a drill holding and advancing member, a drill supported by said drill holding and advancing member, and drive mechanism connectible with said casing of said planetary gear reduction device for imparting independent or simultaneous translational and rotational movement to said drill holding and advancing member including a gear integral with the outer casing of said planetary gear reduction device, a drive shaft supported within said swinging arm and a geared connection from said gear integral with the outer casing of said planetary gear reduction device to said drive shaft.

10. In a drilling apparatus, a support including a mining machine, said mining machine including a motor, a forwardly extending cutter bar, ilexible feeding mechanism rearwardly of said cutter bar, means for driving said flexible feeding mechanism from said motor including a planetary gear reduction device having an outer casing a swinging arm supported on said mining machine, drilling mechanism including a drilling head supported on the free end of said swinging arm for adjustment about axes coincident with and perpendicular to the longitudinal axis of said swinging arm. said drilling head including a drill holding and advancing member, a drill supported by said drill holding and advancing member, and drive mechanism connectible with said casing of said planetary gear reduction device for imparting independent or simultaneous translational and rotational movement to said drill holding and advancing member including a gear on the outer casing of said planetary gear reduction device, a drive shaft supported within said swinging arm, a geared connection from said gear on the outer casing of said planetary gear reduction device to said drive shaft, a spur gear journale-d in said drilling head and having driving connection with said drill holding and advancing member and a spur gear on the outer end of said drive shaft for driving said rst mentioned spur gear in al1 positions of adjustment of said drilling head with respect to said swinging arm.

ll. In a drillng apparatus, a motor, a longitudinally extending pivotally movable arm, a drilling head on the forward end of said means for supporting said drilling head on said arm, sai-d supporting means being adjustable with respect to said arm about an axis coincident with the longitudinal axis of said arm, and said drilling head being pivotally mounted on said supporting means to move in a plane perpendicular to the longitudinal axis of said longitudinally extending arm, a threaded member supported by and movable in said drilling head, adjustable drill clamping means on said threaded member, a drill carried within said threaded member, means for imparting translational and rotational movement to said drill comprising a gear feathered to said threaded member and feeding and supporting means engageable with threads on said threaded member, and means for driving said gear from said motor comprising a spur gear having driving engagement with said rst-mentioned gear in all positions of said drilling head with respect to said longitudinally extending arm and a shaft within said supporting arm.

12. In combination with a mining machine, a`

motor, a supporting member extending-transversely of said mining machine rearwardly of said motor, a longitudinally extending supporting arm on the outer end of said supporting member and movable about the axis of said member, a drilling head on the forward portion of said arm mounted for adjustable movement with respect thereto about an axis coincident with the longitudinal axis of said arm and about an axis perpendicular to said longitudinal axis, drill feeding and rotating means on said head comprising a threaded member including a quick releasable clamping means on said threaded member for holding a drill within said threaded member, a gear feathered to said threaded member, feeding and supporting means engaging threads on said threaded member, and means for driving said gear in all positions of said drilling head with respect to said supporting arm comprising a driving gear and a shaft extending the length of said longitudinally extending arm and within said arm.

13. In a drilling apparatus, a mining machine slidable on its bottom on the mine bottom, a motor on said mining machine, a planetary gear reduction device driven by said motor, a swinging. arm mounted on said mining machine, a drilling head mounted on said swinging arm for movement about an axis coincident with the longitudinal axis of said arm and for movement about an axis perpendicular to said longitudinal axis of said arm, a drill holding and advancing member on said drilling head, a drill supported by said drill holding and advancing member, and drive mechanism connectible with said planetary gear reduction device for imparting independent or simultaneous translational and rotational movement to said drill holding and advancing member in all positions of said drilling head with respect to said motor.

- 14. In a drilling apparatus, a mining machine slidable on its own bottom on the mine bottom, a motor on said mining machine, a planetary gear reduction device driven by said motor, a swinging arm, a drive shaft within said swinging arm driven by said planetary gear reduction device, a drilling head mounted on said swinging arm for movement about an axis coincident with the longitudinal axis of said arm and for movement about an axis perpendicular to said longitudinal axis of said arm, a drill holding and advancing member on said drilling head, a drill supported by said drill holding and advancing member, and drive mechanism connectiblev with said drive shaft for imparting simultaneous translational and rotational movement to said drill holding and advancing member in all positions of said drilling head with respect to said motor.

15. In an apparatus of the class described, a

mining machine slidable on its bottom on the mine bottom, a motor on said mining machine, a planetary gear reduction device driven by said motor including a casing, an arm supported at one end of said mining machine for rocking movement with respect thereto, a drilling head mounted on the free end of said arm for adjustment about an axis coincident with the longitudinal axis of said arm and about an axis perpendicular to the longitudinal axis of said arm, a drill holding and advancing member carried by said drilling head, a drill carried by said drill holding and advancing member, and means for driving said drill from said casing in the several permissible positions of adjustment of said drill with respect to said arm.

16. In an apparatus of the class described, a mining machine slidable on its bottom on the mine bottom, a motor on said mining machine, a planetary gear reduction device driven by said motor including a casing, an arm supported at one end of said mining machine for rocking movement with respect thereto, a drilling head mounted on the free end of said arm for adjustment about an axis coincident with the longitudinal axis of said arm and about an axis perpendicular to the longitudinal axis of said arm, a drill holding and advancing member carried by said drilling head, a drill carried by said drill holding and advancing member, and means for driving said drill from said casing in the several permissible positions of adjustment of said drill with respect to said arm including a drive shaft carried within said arm.

FREDERICK W. VODOZ. 

